Stick your tongue out and bend your head back. Fold your hands and keep them under the communion rail veil.
Also, note for priests: you simply lay the host on the tongue in this manner, as seen in the lower photo - this way you can actually see the host lay gently on the tongue. Do not flip your hand over and try to place the host on the tongue, as many do.
Source: KNOW YOUR MASS which is my favorite book on the Mass for kids and adults, buy HERE.